Discovery interrogatories and privacy and/or safety issues.

Yes, you can object. Assuming your responses are timely served, you can object by responding with: "Objection. This interrogatory seeks information which is irrelevant and not reasonably calculated to lead to the discovery of admissible evidence. Further objection is made on the grounds that this interrogatory invades Responding Party's right of privacy."

Mr. Chen has given a good textbook response. I just want to warn you that once you make that objection, the other side may very well move to compel further responses, and you issues may not withstand that motion. If you are found to have stated non meritorious objections, you might be monetarily sanctioned. If forced to provide the information your ultimate approach may be to seek a restraining order against the landlords if you can point to specific threats or rational bases for your fears. Good luck to you.

You need a valid objection. If there is one, then you can object. Typically, they are entitled to discover your address, particularly including if you are the Plaintiff who filed the suit. Sometimes a party can file something under seal with the court- but that requires court approval. You would need to consult with a lawyer in your area to discuss the issues further as there is more information that you have not provided that might be relevant.